Object edge point filtering system for machine vision
US5796868A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 28, 1995 |
| Grant date | Aug 18, 1998 |
| Priority date | — |
| Expiry date | Dec 28, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20081
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system and method for filtering edge points in an edge image represented by an array of edge image coordinates each having an edge point magnitude. An edge map array is formed of edge map coordinates each assigned one of three edge indicator values indicative of the relationship between the corresponding edge image coordinate edge point magnitude and two preselected edge magnitude thresholds. An output edge point array is formed of output edge point coordinates to indicate those edge image coordinates and corresponding object image pixels that are validated by the system as being associated with likely object edge points. This is accomplished by constructing a first address stack to track memory addresses at which edge map coordinate values are stored and constructing a second address stack to track memory addresses at which output edge point coordinate values are stored as the output edge point array is constructed. Selected output edge point coordinates are assigned with a preselected edge point value by first scanning the edge map array for edge coordinates assigned the first preselected edge indicator value and, using the stacks to keep track of the addresses of these coordin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.